Twitter CEO Jack Dorsey, accompanied by Facebook COO Sheryl Sandberg, testify before the Senate Intelligence Committee hearing on "Foreign Influence Operations and Their Use of Social Media Platforms" on Capitol Hill, Sept. 5, 2018, in Washington. Lawmakers are expected to ask the top executives what measures they are implementing to protect their online content from Russian propaganda and political censorship. The CEO of Alphabet (Google) Larry Page was invited to testify but did not show. Jose Luis Magana, AP